[SeaBIOS] [PATCH 3/4] csm: Move pci_probe_devices() from InitializeYourself phase to PreparToBoot phase

[Bin Gao]

On physical hardware, some PCI devices are not detectable when
UEFI invokes our InitializeYourself() function. But they
are guaranteed to be available before UEFI invokes our
PreparToBoot() function.

Signed-off-by: Bin Gao 
---
 src/fw/csm.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/fw/csm.c b/src/fw/csm.c
index f64bc73..1bd821e 100644
--- a/src/fw/csm.c
+++ b/src/fw/csm.c
@@ -64,7 +64,9 @@ static void
 csm_maininit(struct bregs *regs)
 {
     interface_init();
-    pci_probe_devices();
+
+    if (CONFIG_CSM && CONFIG_QEMU_HARDWARE)
+        pci_probe_devices();

csm_compat_table.PnPInstallationCheckSegment = SEG_BIOS;
     csm_compat_table.PnPInstallationCheckOffset = get_pnp_offset();
@@ -144,6 +146,13 @@ handle_csm_0002(struct bregs *regs)
         return;
     }

+    // On physical hardware, some PCI devices are not detectable when
+    // UEFI invokes our InitializeYourself() function. But they
+    // are guaranteed to be available before UEFI invokes our
+    // PreparToBoot() function.
+    if (CONFIG_CSM && !CONFIG_QEMU_HARDWARE)
+        pci_probe_devices();
+
     dprintf(3, "PrepareToBoot table %04x:%04x\n", regs->es, regs->bx);

struct e820entry *p = (void *)csm_compat_table.E820Pointer;